Oil-overflow plug



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RAOUL ratione, or rrfrfrsBUnerr, ann JOHN L. Bnowlv'or wiLxnvsBUne, .enmisYLvANrA, A.ssronons rro wns'rrivonotrsn Ennorarc Ann MANUFACTURING coinranv, a CORPORATION or rmvivsvnvaivrn.

orL-ovnnnnow PLUG.

Application led March 1, 1923. Serial No. 622,094.

To aZZ whom t may concern.'

Be it known that we, RAOUL PRUGER, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, and JOHN L. BROWN, a citizen` of the United States, and a resident of lVilkinsburg, in the county of Allegheny and State of. Pennsylvania, have invented a new and useful Improvement in Oil-Overflow Plugs, of whichthe following is a specification. K

Our invention relates to -oil overflow' plugs and it has particular 4relation to'plugs having their overflow portions provided with covers.

Considerable diliiculty has been experienced with covered overiiow plugs, when employed to drain excess oil from bearings, because of the siphoning of the oil from the bearing, by reason of a partial-vacuum condition being established at the covered overflow portion thereof. When such condition has occurred, the oil would continue todrip from the edge of the overflow, where an oil seal had formed between the edge of the overflow portion of the plug and its cover, until such time as the oil head was lowered sufficiently to resist the capillary action, thus breaking the seal.

The problem of preventing siphoning, while protecting the overflow plug from dirt, is an exceedingly diliicult one, owing to the fact that oil films will form persistently over even large-sized openings, thus hermetically sealing the cap-portion of the plug. It was only after much experimenting and redesigning of the covered Overflow plug that a successful cure for the siphoning evil was devised by the combination of a numjber of improved features operating in conjunction.

The object of our invention is, therefore, to provide an Overflow plug structure, wherein the siphoning of the oil from the bearing is entirely eliminated.

n the accompanying drawing:

Figure 1 is a plan View of our improved overflowing plug,

Fig. 2 is a view in longitudinal section thereof,`on the line II-II of Fig. 1, and

Fig. 3 is a view in cross section thereof, on

the line IHH of Fig. 1.

As shown in the drawing, the device comprises a substantially bowl-shaped overflow substantially like 'but greater contour than the overflow body, is provided. The flange portion 0f the cover is extended a short distance at its rear to provide hinge lugs k'i' by which'it is connected to the hinge lug l of the overflow body, by a hinge pintle 8. The forward end of the cover fiange 6 rests upon the abutment lug 3 of the overflow bowl. l/Vhen the lid is thus disposed, an overflow space is provided all the way aroundthe bowl and over the edge thereof, as shown.

In practice, when an excessive amount of oil is supplied to a bearing, the housing of which is equipped with my device, the oil rises in the bowl l, and as there is suflicient space about and above the edge thereof and lid, the excess oil is free to drip from the edgeof the bowl. rihe space just mentioned is not only suiiicient to permit the excess oil to pass freely over the bowl edge. but an air space is left between the bowl edge and the lid, whereby the possibility of any siphoning ofthe oil from the bearing, as a result of an oil seal formed between the bowl and, lid is eliminated.

It has been found desirable to provide a cover of hollow form, leaving considerable air space above the oil surface, in addition to the air and overflow space between the cover and bowl. In case the housing should be filled too rapidly, so that the oil-head rises faster than the overflowing operation can compensate therefor. the hollow space in the cover may become filled with oil, tend ing to produce a siphoning effect. An air hole 9 has, therefore, been provided in order to prevent the occurrence of a vacuum condition.

By extending the cover down below the edge of the Overliow bowl. the entrance of foreign matter is prevented.

While we have shown and described a certain embodiment of our invention, it will be evident that modifications may be adopted within the spirit of our invention. We

` desire, therefore, lthat the appended claims shall be accorded the broadest Construction, consistent with the prior art.

We claim as our invention:

l. An oil overflow device comprising a hollow plug having an elevated overflow body portion and an overhanging cover supported above the overflow portion to provide free overflow space therebetween.

2. On oil overflow device comprisin a hollow plug having an elevated over ow body portion and a cover hingedly secured thereto, said cover being of hollow structure and extending over and below the edge of said bodv portion and leaving an interiorly communicating overflow space thereabout.

3. An oil overflow device, comprising a hollow plug having an elevated overflow body portion and a cover hingedly secured thereto, and provided with an air orifice, said cover being of hollow structure and extending over and below the edge of said body portion and leaving an interiorly'communicating overflow space thereabout.

1. A n oil overflow device comprising av hollow plug having an elevated and enlarged overflow body portion at its free end and having a cover abutment, and a substantially dome shaped cover hinged to said body portion and having its free end engaging said abutment, said cover extending below the edge of the overflow body and providing free overfiow space.

5. An oil overflow device comprising a hollow plug having an elevated and enlarged overflow body portion at its free end and having a cover abutment, and a substantially dome shaped cover provided with an air orifice and hinged to said body por tion, said cover having its free end engaging the abutment thereof, and extending below the edge of the overflow body and providing free overflow space.

6. An oil overflow device comprising a hollow plug having an elevated and enlarged overflow body portion provided at its free end with a cover abutment, and a covery hinged to said body portion and en gaging said abutment, said cover extending below the edge of the overflow ibody to provide free overfiow space and having its eentral portion elevated to provide a greater air space thereat than at the edge of the overflow.

In testimony whereof, we have hereunto subscribed our names this 21st day of February, 1923.

RAOUL PRUGER. JOHN L. BROWN. 

